{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In this work , a facile photoinduced one - step method was first developed for the covalent immobilization of ATRP initiators on the C - H group - containing substrates such as biaxially oriented polypropylene ( BOPP ) ."}
{"Chemical": ["C - H", "polypropylene"]}